What is sum of 88 + 11?

Answer: 88 + 11 = 99

Addition using Number Line

  • Step 1: Begin by positioning the first number (88) as the starting point on the number line.
  • Step 2: Next, progress from the first number by units equivalent to the second number towards the right. This is due to the ascending nature of values on the number line toward the right. For instance, when adding 88 + 11, advance 11 units to the right. This progression leads to the number 99. Hence, 88 + 11 = 99.

The following animation demonstrates the Number Line method,

85 86 87 Start 88 89 90 91 92 93 94 95 96 97 98 End 99 100 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10 +11 +11 ©AskMathGuru
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Addition using Place Values

  • Step 1: Arrange the numbers 88, 11 (addends) to align them properly in respective columns for ones, tens, hundreds, and Thousands… stacking them vertically.
  • Step 2: Sum the numbers from the rightmost column, moving leftward, beginning with the ones column, followed by the tens column, and hundreds column till the leftmost column.
  • Step 3: If the sum in any of the columns is more than 9, we regroup this sum into tens and ones. We write the ones digit of this sum under that particular column and we carry over the tens digit of the sum to the next column. This carried-over digit is added along with the addends of that specific column.
  • Step 4: The total of the provided numbers is achieved by adding all the columns together. In this problem, the total is 99

The following animation demonstrates the Place Value method,

O T 8 8 1 1 + 9 9 ©AskMathGuru
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